Datasheet

Device Configuration
AnalogOut
AnalogIn
Endpoint#0
DefaultEndpoint
Endpoint#1
(IF#1)
AudioStreamingInterface
Endpoint#1
(IF#1)
AudioStreamingInterface
IT
TID3
S
UID4
OT
TIDB
S
UIDA
Standard AudioControlInterface(IF#0)
OT
TID6
IT
TID7
IT
TID1
UID5
FU
UID2
FU
UID8
FU
Interface #0
PCM2912A
www.ti.com .......................................................................................................................................................................................... SLES230 – SEPTEMBER 2008
Figure 31 illustrates the USB audio function topology. The PCM2912A has three interfaces. Each interface is
constructed with some alternative settings.
Figure 31. USB Audio Function Topology
Interface #0 is the control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative
setting #0 describes the standard audio control interface. The audio control interface is constructed with a series
of terminal connections. The PCM2912A has the following 10 terminals:
• Input terminal (Terminal ID#1) for audio analog input for sidetone
• Feature unit (Unit ID#2) for sidetone PGA
• Input terminal (Terminal ID#3) for isochronous out stream
• Mixer unit (Unit ID#4) for sidetone mixing
• Feature unit (Unit ID#5) for analog output PGA
• Output terminal (Terminal ID#6) for audio analog output
• Input terminal (Terminal ID#7) for audio analog input
• Feature unit (Unit ID#8) for analog input PGA
• Mixer unit (Unit ID#A) for analog input
• Output terminal (Terminal ID#B) for isochronous in stream
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Product Folder Link(s): PCM2912A